I am little confused about System.Global. According to this document (third point under Important Behavioral Changes) it says that few of the features like turning airplane mode on/off have been include in System.Global in Android 4.2 and higher so its now read only we cannot write it.
Along with airplane mode there is also Bluetooth turn on/off feature included in System.Global which means we shouldn't be able to toggle Bluetooth on/off programmatically since its read only.
But I have some app in my Nexus 7 which runs on version 4.4.2 where the app can easily turn on/off Bluetooth on voice command (one such app is 'Assistant')
How is it possible if the features in System.Global are read only?
Any explanation on this topic will be very much appreciated. Thanks in advance :)
System settings are generally read-only for normal apps. The "Assistant" or "Settings" applications are bundled with the platform and have special permissions. Bluetooth does expose the ability to turn a given "adapter" off and on via the BluetoothAdapter class.